// Copyright(c) 2019 - 2020, #Momo
// All rights reserved.
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// modification, are permitted provided that the following conditions are met :
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// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include "Utilities/Array/ArrayView.h"

namespace MxEngine
{
    class Shader;
    class Material;
    struct DirectionalLightUnit;
    struct PointLightUnit;
    struct SpotLightUnit;
    struct RenderList;
    struct RenderUnit;

    class ShadowMapGenerator
    {
        const RenderList& shadowCasters;
        ArrayView<RenderUnit> renderUnits;
        ArrayView<Material> materials;
    public:
        enum class LoadStoreOptions
        {
            CLEAR = 1 << 0, 
            LOAD = 1 << 1,
        };

        ShadowMapGenerator(const RenderList& shadowCasters, ArrayView<RenderUnit> renderUnits, ArrayView<Material> materials);
        ~ShadowMapGenerator();

        void GenerateFor(const Shader& shader, ArrayView<DirectionalLightUnit> directionalLights, LoadStoreOptions options);
        void GenerateFor(const Shader& shader, ArrayView<PointLightUnit> pointLights, LoadStoreOptions options);
        void GenerateFor(const Shader& shader, ArrayView<SpotLightUnit> spotLights, LoadStoreOptions options);
    };

    ShadowMapGenerator::LoadStoreOptions operator|(ShadowMapGenerator::LoadStoreOptions options1, ShadowMapGenerator::LoadStoreOptions options2);
    bool operator&(ShadowMapGenerator::LoadStoreOptions options1, ShadowMapGenerator::LoadStoreOptions options2);
}